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490<br />
● Epiphytic on tree trunks in open forests; 700–2000 m. C and S<br />
Taiwan.<br />
7. Luisia brachystachys (Lindley) Blume, Rumphia 4: 50.<br />
1849.<br />
小花钗子股 xiao hua chai zi gu<br />
Mesoclastes brachystachys Lindley, Gen. Sp. Orchid. Pl.<br />
45. 1830; Luisia siamensis Rolfe ex Downie.<br />
Stems suberect, to 18 cm, stout, ca. 7 mm in diam., internodes<br />
1–1.5 cm. Leaves 9–11 cm × 3–4 mm, obtuse. Inflorescences<br />
2 or 3, ca. 1 cm, 3–6-flowered; rachis 3–4 mm in diam.;<br />
floral bracts ovate-triangular, ca. 2 mm, fleshy. Flowers opening<br />
widely, sepals and petals yellowish green, abaxial midvein purplish<br />
brown, lip pale yellow, column green, purple margined,<br />
anther cap yellow spotted with purple; pedicel and ovary pale<br />
yellow, tinged with purplish brown, ca. 6 mm. Dorsal sepal<br />
ovate, ca. 4 × 2.3 mm, obtuse; lateral sepals ovate-oblong, 4–<br />
4.5 × ca. 2.5 mm, dorsally slightly carinate and keel becoming<br />
winged at apex, apex obtuse. Petals narrowly oblong, 5–6 ×<br />
1.6–1.8 mm, obtuse; lip ca. 5 mm, glabrous, without a distinct<br />
boundary between epichile and hypochile; hypochile concave,<br />
narrower than epichile, base without distinct lateral lobes; epichile<br />
nearly suborbicular or triangular-rhombic, ca. 3 × 4.5 mm,<br />
obtuse. Column ca. 2.5 mm, stout. Fl. Apr. 2n = 40.<br />
Epiphytic on tree trunks in forests along valleys; 600–1300 m. S<br />
Yunnan [Bhutan, India, Laos, Myanmar, Vietnam].<br />
8. Luisia zollingeri H. G. Reichenbach, Ann. Bot. Syst. 6: 622.<br />
1863.<br />
长叶钗子股 chang ye chai zi gu<br />
Stems erect or arching, to 30 cm, 5–7 mm in diam., sometimes<br />
branched, internodes 1.5–2 cm. Leaves usually borne<br />
from upper part of stem, 12–17 cm × 3–4 mm, obtuse. Inflorescences<br />
opposite to leaves, ca. 1 cm, 3–6-flowered; rachis ca. 7<br />
mm, thick; floral bracts broadly ovate-triangular, ca. 2 mm,<br />
fleshy. Flowers opening widely, sepals and petals pale pink,<br />
abaxially lateral sepals yellowish green in basal half, lip purplered,<br />
apical margin green, abaxially yellowish green, column<br />
purplish red, anther cap yellow; pedicel and ovary green, ca. 6<br />
mm. Dorsal sepal ovate, ca. 4 × 3 mm, obtuse; lateral sepals<br />
subovate, ca. 6 × 2.8 mm, dorsally slightly carinate, but winged<br />
toward apex and forming a narrowly winged mucro protruding<br />
from apex. Petals obovate-elliptic, ca. 5 × 3.2 mm, obtuse; lip<br />
ca. 5 × 4.5 mm, without a distinct boundary between epichile<br />
and hypochile; hypochile broader than epichile, concave, with 2<br />
small lateral lobes, and a pair of calli at base bordering base of<br />
column; epichile suborbicular, glabrous, entire. Column ca. 2.5<br />
mm, thick. Fl. May.<br />
Epiphytic on tree trunks in forests along valleys; 500–1000 m. S<br />
Yunnan [India (Andaman Islands), Indonesia, Malaysia, Thailand, Vietnam].<br />
9. Luisia filiformis J. D. Hooker, Fl. Brit. India 6: 23. 1890.<br />
长瓣钗子股 chang ban chai zi gu<br />
Stems often pendulous, 34–90 cm, 4–5 mm in diam., internodes<br />
3–4 cm. Leaves secund, 14–26 cm × ca. 3 mm. Inflorescences<br />
erect, arising from lower part or near base of stem, 1–2<br />
EPIDENDROIDEAE<br />
cm, few flowered; floral bracts broadly ovate-triangular, ca. 2<br />
mm, fleshy. Flowers slightly fleshy, whitish, lip dark purple;<br />
pedicel and ovary ca. 8 mm. Dorsal sepal ovate, ca. 7 × 3 mm,<br />
concave, obtuse; lateral sepals similar to dorsal sepal, ca. 8 × 3<br />
mm, dorsally carinate and becoming winged at apex. Petals<br />
linear, 8–11 × 1.5–1.7 mm, obtuse; lip ca. 7 mm, with a distinct<br />
boundary between epichile and hypochile; hypochile lateral<br />
lobes ca. 4 × 4 mm; epichile broadly ovate-triangular, ca. 4 × 5<br />
mm, adaxially with several papillate longitudinal ridges, apex<br />
obtuse. Column ca. 4 mm. Fl. Apr–Jun.<br />
Epiphytic on tree trunks in dense forests; 300–1100 m. S and SE<br />
Yunnan [Bhutan, India (NE and Orissa), Laos, Thailand, Vietnam].<br />
10. Luisia ramosii Ames, Philipp. J. Sci., C, 6: 55. 1911.<br />
宽瓣钗子股 kuan ban chai zi gu<br />
Stems often arching, ca. 28 cm, 4–5 mm in diam., internodes<br />
ca. 1.5 cm. Leaves mostly on upper part of stem, 8–11<br />
cm × 3.5–4 mm, obtuse. Inflorescences opposite to leaves, ca. 1<br />
cm, 3–6-flowered; floral bracts broadly ovate-triangular, ca. 2<br />
mm, thickly leathery. Flowers opening widely, purplish red,<br />
thinly textured; pedicel and ovary ca. 8 mm. Dorsal sepal<br />
elliptic, ca. 5 × 3 mm, concave, obtuse; lateral sepals slightly<br />
oblique, oblong, ca. 6 × 3 mm, dorsally carinate and winged<br />
toward apex; wing abruptly contracted and protruding from<br />
apex forming an awn. Petals ovate, ca. 6.2 × 3.2 mm, obtuse;<br />
lip 6–6.5 mm, strongly contracted near middle, with a distinct<br />
boundary between epichile and hypochile; hypochile 5.5–7 mm<br />
wide, broader than epichile, concave; epichile somewhat reniform-triangular,<br />
5–6.2 mm wide, entire, obtuse. Column ca. 3<br />
mm; stipe ovate, ca. 0.8 mm; viscidium suborbicular, large, ca.<br />
1.3 mm wide. Fl. May–Jun. 2n = 38, 40.<br />
Epiphytic on tree trunks in open forests along valleys; 100–500 m.<br />
Guangxi, Hainan [Philippines, Vietnam].<br />
Luisia trichorrhiza (Hooker) Blume was reported from Hainan<br />
(Merrill & Metcalf, Lingnan Sci. J. 21: 12. 1945) and Xizang (K. Y.<br />
Lang in C. Y. Wu, Fl. Xizang. 5: 776. 1987). The specimens reported<br />
from Hainan were identified by us as Luisia ramosii, and those of<br />
Xizang (Qinghai-Xiang Exp. Team 74–4223) remain doubtful, as they<br />
only bear young fruit.<br />
11. Luisia cordata Fukuyama, Bot. Mag. (Tokyo) 48: 306.<br />
1934.<br />
心唇钗子股 xin chun chai zi gu<br />
Stems erect or pendulous, 30–60 mm, ca. 5 mm in diam.,<br />
usually unbranched. Leaves ca. 20 cm × 3 mm, acute at apex.<br />
Inflorescences 2- or 3-flowered; floral bracts distichous,<br />
broadly ovate, ca. 3 mm, acute. Flowers often nodding, ca. 1 cm<br />
in diam., sepals and petals green, lip deep purple-red; pedicel<br />
and ovary green, ca. 1 cm. Dorsal sepal ligulate, ca. 5 × 3 mm,<br />
5-veined, obtuse; lateral sepals ovate-lanceolate, cymbiform, ca.<br />
6 × 4 mm, dorsally carinate, 7-veined, apex acute. Petals linear,<br />
ca. 7.5 × 2 mm, acute; lip ca. 7 mm, fleshy, glabrous, without a<br />
distinct boundary between hypochile and epichile; hypochile<br />
ca. 3 × 4.5 mm, concave, lateral lobes very short; epichile cordate,<br />
large, ca. 4 × 5 mm, with a swelling near apex. Column<br />
ca. 3.5 mm. Fl. Jan.<br />
● Epiphytic on tree trunks in thickets along the seashore. S<br />
Taiwan.